feat(app): get closest metro station

app/metro-now/metro-now-tests/metroUtilsTests.swift

@@ -5,6 +5,7 @@
 //  Created by Kryštof Krátký on 15.05.2024.
 //
 
+import CoreLocation
 @testable import metro_now
 import SwiftUI
 import XCTest
@@ -53,27 +54,23 @@ final class metroUtilsTests: XCTestCase {
 
     func testsGetMetroLineColorOutputEnum() {
         /// init variables for testing
-        var lineLetter: String
         var result: Color
         var expectedResult: Color
 
         /// test 1
-        lineLetter = MetroLine.A.rawValue
-        result = getMetroLineColor(lineLetter)
+        result = getMetroLineColor(.A)
         expectedResult = Color.green
 
         XCTAssertEqual(result, expectedResult)
 
         /// test 2
-        lineLetter = MetroLine.B.rawValue
-        result = getMetroLineColor(lineLetter)
+        result = getMetroLineColor(.B)
         expectedResult = Color.yellow
 
         XCTAssertEqual(result, expectedResult)
 
         /// test 3
-        lineLetter = MetroLine.C.rawValue
-        result = getMetroLineColor(lineLetter)
+        result = getMetroLineColor(.C)
         expectedResult = Color.red
 
         XCTAssertEqual(result, expectedResult)
@@ -106,4 +103,108 @@ final class metroUtilsTests: XCTestCase {
 
         XCTAssertEqual(result, expectedResult)
     }
+
+    func testsGetClosestStationFromGeoJSON() {
+        /// init variables for testing
+        var location: CLLocation
+        var result: MetroStationsGeoJSONFeature?
+
+        /// test 1
+        location = CLLocation(
+            latitude: 50.078453,
+            longitude: 14.430676
+        )
+        result = getClosestStationFromGeoJSON(
+            location: location
+        )
+
+        XCTAssertEqual(
+            result?.properties.name,
+            "Muzeum"
+        )
+
+        /// test 2
+        location = CLLocation(
+            latitude: 50.079591,
+            longitude: 14.430883
+        )
+        result = getClosestStationFromGeoJSON(
+            location: location
+        )
+
+        XCTAssertEqual(
+            result?.properties.name,
+            "Muzeum"
+        )
+
+        /// test 3
+        location = CLLocation(
+            latitude: 50.080094,
+            longitude: 14.429663
+        )
+        result = getClosestStationFromGeoJSON(
+            location: location
+        )
+
+        XCTAssertEqual(
+            result?.properties.name,
+            "Muzeum"
+        )
+
+        /// test 4
+        location = CLLocation(
+            latitude: 50.074929,
+            longitude: 14.430177
+        )
+        result = getClosestStationFromGeoJSON(
+            location: location
+        )
+
+        XCTAssertEqual(
+            result?.properties.name,
+            "I. P. Pavlova"
+        )
+
+        /// test 5
+        location = CLLocation(
+            latitude: 50.075499,
+            longitude: 14.322204
+        )
+        result = getClosestStationFromGeoJSON(
+            location: location
+        )
+
+        XCTAssertEqual(
+            result?.properties.name,
+            "Nemocnice Motol"
+        )
+
+        /// test 6
+        location = CLLocation(
+            latitude: 50.047485,
+            longitude: 14.460385
+        )
+        result = getClosestStationFromGeoJSON(
+            location: location
+        )
+
+        XCTAssertEqual(
+            result?.properties.name,
+            "Kačerov"
+        )
+
+        /// test 7
+        location = CLLocation(
+            latitude: 50.040648,
+            longitude: 14.456518
+        )
+        result = getClosestStationFromGeoJSON(
+            location: location
+        )
+
+        XCTAssertEqual(
+            result?.properties.name,
+            "Kačerov"
+        )
+    }
 }

app/metro-now/metro-now-utils/metroUtils.swift

@@ -5,7 +5,9 @@
 //  Created by Kryštof Krátký on 15.05.2024.
 //
 
+import CoreLocation
 import Foundation
+import MapKit
 import SwiftUI
 
 enum MetroLine: String {
@@ -26,3 +28,45 @@ func getMetroLineColor(_ letter: String) -> Color {
         .purple
     }
 }
+
+func getMetroLineColor(_ letter: MetroLine) -> Color {
+    switch letter {
+    case .A:
+        .green
+    case .B:
+        .yellow
+    case .C:
+        .red
+    }
+}
+
+func getClosestStationFromGeoJSON(location: CLLocation) -> MetroStationsGeoJSONFeature? {
+    let stations: MetroStationsGeoJSON? = getParsedJSONFile(.METRO_STATIONS_FILE)
+
+    guard let stations else {
+        return nil
+    }
+    guard stations.features.count > 0 else {
+        return nil
+    }
+
+    var closestStationIndex = 0
+    var closestStationDistance: Double = location.distance(from: CLLocation(
+        latitude: stations.features[0].geometry.coordinates[1], longitude: stations.features[0].geometry.coordinates[0]
+    ))
+
+    for (index, station) in stations.features.enumerated() {
+        let distance = location.distance(from: CLLocation(
+            latitude: station.geometry.coordinates[1], longitude: station.geometry.coordinates[0]
+        ))
+
+        if closestStationDistance > distance {
+            closestStationIndex = index
+            closestStationDistance = distance
+        }
+    }
+
+    return stations.features[closestStationIndex]
+}
+
+func getSortedStationsByDistance() {}